Browse Prior Art Database

Delayed Error Reporting

IP.com Disclosure Number: IPCOM000048251D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Videki, ER: AUTHOR

Abstract

A peripheral system is attached to a host and operates in a sequence of chains of peripheral or I/O (input/output) commands. The operation of the peripheral system is highly overlapped and asynchronous with respect to the host, such that detection of an error relating to a chain of peripheral commands can occur substantially after the chains of commands have been completed. Upon a next start I/O (SIO) operation, the error is reported with a sequence indicator and a peripheral address for enabling the host to recover from the error. At this point in time, the host programs may have been completed. The sequence indicator plus the address enable the host to reconstruct those programs that have been dissipated with respect to a device in the peripheral system associated with the late-reported error.

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Delayed Error Reporting

A peripheral system is attached to a host and operates in a sequence of chains of peripheral or I/O (input/output) commands. The operation of the peripheral system is highly overlapped and asynchronous with respect to the host, such that detection of an error relating to a chain of peripheral commands can occur substantially after the chains of commands have been completed. Upon a next start I/O (SIO) operation, the error is reported with a sequence indicator and a peripheral address for enabling the host to recover from the error. At this point in time, the host programs may have been completed. The sequence indicator plus the address enable the host to reconstruct those programs that have been dissipated with respect to a device in the peripheral system associated with the late-reported error. An allegiance is given to the host through a plurality of unrelated chains of peripheral commands such that the integrity of the signals in the peripheral device will be maintained for facilitating complete recovery from the late-reported error.

A host has an I/O channel connected to a buffer in a peripheral system. The host and the peripheral system communicate through the buffer in a series of chains of peripheral commands, called channel operation chain (COC). The COC-1 results in data being transferred from the host to the buffer for later transmission to a peripheral device (not shown) of the peripheral system. As soon as the data is transferred to the buffer by the plurality of I/O commands of COC-1, the peripheral system signals t...